ABUNDANCE OF HELIOTHINE MOTHS IN TRAPS AT THE INTERFACE OF BT COTTON WITH VARIOUS CROPS IN FOUR GEORGIA COUNTIES: 2003.
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1 ABUNDANCE OF HELIOTHINE MOTHS IN TRAPS AT THE INTERFACE OF BT COTTON WITH VARIOUS CROPS IN FOUR GEORGIA COUNTIES: 23. Stan K. Diffie 1, John R. Ruberson 1, Scott Brown 2, Forrest Connelly 3, Scott Utley 4, and Gibbs Wilson 5 1 Dept. of Entomology, Univ. of Georgia, Tifton, GA; 2 Univ. Of Georgia Coop. Ext. Serv., Colquitt Co.; 3 Univ. Of Georgia Coop. Ext. Serv., Berrien Co.; 4 Univ. Of Georgia Coop. Ext. Serv., Turner Co. 5 Univ. Of Georgia Coop. Ext. Serv., Irwin Co. Introduction The corn earworm and tobacco budworm present serious management challenges to numerous crop systems. In recent years, the corn earworm and tobacco budworm have presented a greater risk to Georgia pest managers by exhibiting pyrethroid resistance, with the tobacco budworm offering the most widespread challenge. Management of insecticide resistance in arthropods relies heavily on the interchange of genetic material between the few resistant individuals that may initially occur in a population and susceptible individuals, diluting the frequency of the resistant genes. Among the unanswered questions is the number of susceptible moths actually present in a given area during the period when resistant individuals might be emerging from a target crop. Resistance management procedures have been federally mandated for users of Bttransgenic to delay or prevent development of resistance in the tobacco budworm, Heliothis virescens, and the corn earworm, Helicoverpa zea. The current guidelines are built on numerous assumptions regarding the timing and abundance of lepidopteran species, and there is a critical need to examine these assumptions experimentally to determine whether the mandated procedures are valid or are in need of revision. One of the assumptions is that high numbers of moths are produced in non-bt, and fewer are produced in non- vegetation (including weeds). It is also assumed that the moths are undertaking considerably more local movement than long-distance dispersal, requiring that the non-bt refuges be located very close (within a mile) to Bt fields. Neither of these assumptions has yet been validated. Understanding the relative timing and spatial abundance of heliothine moths is critical for managing the susceptibility of these pests to Bt-transgenic s and insecticides. This information also is invaluable for understanding the dispersal capacities of these insects, and developing large-scale community-wide pest management strategies. This study is part of a multi-state project examining the spatial dynamics of heliothine moths in relation to Bt-transgenic fields. 161
2 Methods Corn earworm pheromone-baited wire traps similar to those described by Hartstack et al. (1979) were placed at the interface of 5 crop pairs in each of 4 counties in south Georgia (see Table 1 for locations and dates) during the summer of 23. The five interfaces included: 1) Bt /Bt, 2) Bt /non-bt, 3) Bt /Corn, 4) Bt /Peanuts, and 5) Bt /Soybeans. Traps were sampled weekly in all locations. On each sampling date, moths were retrieved from the traps, returned to the lab for counting, and frozen for future analyses (isotope analyses, not reported on here). The pheromone was replaced at each sampling. Moth monitoring was initiated the first week of June and continued through the first week of November. The same trap designs and procedures were used in Berrien, Colquitt, and Irwin Counties for tobacco budworm trapping, except only one trap was placed at each interface of the 5 crop pairs (Table 1). Again, moths were retrieved from the traps weekly, returned to the lab for counting, and frozen for future analyses. Fresh pheromone lure was added at each sampling. Monitoring began the first week of July and ceased the third week of October. Table 1. Pheromone trap sampling period and placement for heliothine moths in south Georgia, 23 County Field pairs CEW Sampling Dates TBW Sampling Dates Berrien Bt and Bt 6/2-11/7 7/7-1/24 Bt and corn 6/2-11/7 7/7-1/24 6/2-11/7 7/7-1/24 Bt and peanuts 6/2-11/7 7/7-1/24 Bt and soybeans 6/2-11/7 7/7-1/24 Colquitt Bt and Bt 6/9-1/3 7/7-1/17 Bt and corn 6/9-1/3 7/7-1/17 6/9-1/3 7/7-1/17 Bt and peanuts 6/9-1/3 7/7-1/17 Bt and soybeans 6/9-1/3 7/7-1/17 Irwin Bt and Bt 6/16-11/7 7/14-1/17 Bt and corn 6/16-11/7 7/14-1/17 6/16-11/7 7/14-1/17 Bt and peanuts 6/16-11/7 7/14-1/17 Bt and soybeans 6/16-11/7 7/14-1/17 Turner Bt and Bt 6/16-1/17 NA Bt and corn 6/16-1/17 NA 6/16-1/17 NA Bt and peanuts 6/16-1/17 NA Bt and soybeans 6/16-1/17 NA 162
3 Results and Discussion Corn earworm trap numbers were comparable for Berrien, Colquitt, and Turner Counties throughout the season, with two nominal peaks in late July and late August (Fig. 1). Moth numbers were substantially higher in Irwin County, with a very pronounced peak in the 4 th week in August (5941 moths collected in the 1 traps). In Berrien County, 1 traps yielded 189 moths during the fourth week of July, when the highest peak for this county occurred. The fourth week of August was the peak capture week in both Colquitt and Turner Counties with a total of 193 and 2753 moths, respectively, collected during this period (Fig. 1). Corn earworm abundance did not appear to correlate distinctly with the crop interface where the traps were located (Fig. 2). In the Bt Cotton/Bt Cotton interface in Berrien County, 4131 moths were captured throughout the summer. In Colquitt County, the largest number of moths (2616) was collected in the Bt Cotton/Non Bt Cotton interface. In Irwin County, the largest number of moths (9576) was collected in the Bt Cotton/Peanut interface, whereas in Turner County, 336 moths were captured in the Bt Cotton/Soybean interface. (Fig. 2). Tobacco budworm numbers peaked the second week of August with 7475 moths captured in 15 traps (498.3 moths/trap). More moths were collected the third week of August than any other week in Irwin County with 3192 captured in 5 traps. The second week of August was the peak week in both Berrien and Colquitt Counties with 2294 and 2638 moths captured, respectively. (Fig. 3). Bt Cotton/Bt Cotton was the highest yielding interface throughout the season in Colquitt County with 4133 moths collected, although the Bt is a wholly unsuitable host. In Berrien and Irwin Counties, the highest yielding interface was Bt Cotton/Peanuts. This interface provided 2777 moths in Berrien County and 6358 moths in Irwin County. (Fig. 4). The number of moths captured throughout the season appeared to be determined more by location (county) than by the crop interface. Irwin County traps often contained more moths than the other counties, although this was more pronounced for the corn earworm than was the case for tobacco budworm. Two factors that may have played a role in influencing this trend were crop maturity and corn acreage. Crop maturity in fields adjacent to the traps in Irwin County was 1-2 weeks behind that in the other counties and may have affected moth phenology and abundance. Also, the acreage of corn grown in Irwin County (11,5) almost equaled the amount in the other three counties combined (12,9), which could have affected corn earworm populations. There was a significant positive correlation between the total number of corn earworm moths captured and the total corn acreage in the counties (Fig. 5), as also was the case in 22 (Ruberson et al. 23). It should be pointed out that the period of trap exposure differed somewhat among counties, so that the total moth counts are not quite as accurate an indicator 163
4 of overall activity as weekly catches. However, the total counts would vary little if adjusted for duration of trap exposure, as the period of time during which traps in the various counties did not overlap yielded few moths. For tobacco budworms, the Bt Cotton/Peanut interface yielded the largest number moths in two of the three counties sampled; however, in this same interface corn earworm moths were the most abundant in only one of four counties. Four different crop interfaces ranked as the largest producer of corn earworm moths in the four counties, indicating no preference for particular Bt /crop combinations. The frequent trapping of good numbers of moths of both species at the Bt Cotton/Bt Cotton interface (from which, presumably, no tobacco budworms and few corn earworms emerge) suggests that the moths are moving over fairly long distances. Pheromone trapping provides a valuable tool for assessing activity of moths, but it does not necessarily reflect activity within crop fields (e.g., impending caterpillar populations), nor does it provide insights into the activity of the moths trapped (e.g., are they coming to the location of the traps, or are they emerging locally and being trapped while attempting to emigrate?). Supplementing trap capture with other techniques (e.g., isotope analysis) can provide additional insights into the sources of trapped moths and broaden our base of understanding relative to the mobility of these two important pests in the landscape. Acknowledgements We appreciate the funding provided for this project by USDA-ARS and the Georgia Cotton Commission. We also appreciate the growers who cooperated with us: Andy and Randall Carroll, Ken Coleman, John Dixon, Jason Griffin, Marvin Knox, John Morgan, Darrell Ross, Jody Speight, and Jeff Wilson. We appreciate the assistance of Brian Rutland and Logan Edwards in collecting and processing samples and data. References Hartstack, A.W., D.E. Hendricks, J.D. Lopez, E.A. Stadelbacher, J.R. Phillips, and J.A. Witz Adult sampling, PP In Economic Thresholds and Sampling of Heliothis Species on Cotton, Corn, Soybeans and Other Host Plants. South. Coop. Series Bull Ruberson, J.R., S. Brown, F. Connelly, S. Utley, and G. Wilson. 23. Pheromone Trap Captures of the Corn Earworm, Helicoverpa zea, in Relation to Bt Cotton in Four Georgia Counties, pp In Cotton Research-Extension Report 22 (ed. AS Culpepper, OL May & PH Jost), Univ. Georgia Coop. Ext. Serv., Athens, GA. 164
5 No. moths / trap /2/3 6/16/3 6/3/3 7/14/3 7/28/3 8/11/3 8/25/3 9/8/3 9/22/3 1/6/3 1/2/3 11/3/3 Date Berrien Colquitt Irwin Turner Figure 1. Corn earworm trap captures in four south Georgia counties, No. Moths Berrien Colquitt Irwin Turner County Bt/Bt Bt/Corn Bt/Peanuts Bt/Soybeans Bt/Non Bt Figure 2. Number of corn earworm moths captured at different crop interfaces in south Georgia,
6 No. Moths / Trap /7/3 7/14/3 7/21/3 7/28/3 8/4/3 8/11/3 8/18/3 8/25/3 9/1/3 9/8/3 9/15/3 9/22/3 9/29/3 1/6/3 1/13/3 1/2/3 Date Berrien Colquitt Irwin Figure 3. Tobacco budworm trap captures in three south Georgia counties, 23. No. Moths Berrien Colquitt Irwin County Bt/Bt Bt/Corn Bt/Peanuts Bt/Soybeans Bt/Non Bt Figure 4. Number of tobacco budworm moths captured at different crop interfaces in south Georgia,
7 Acres of corn/county y = x R 2 = Total moths captured Figure 5. Relationship between corn acreage in the respective counties and the total trap capture of corn earworm moths in four counties in south Georgia (23). 167
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